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STMicroelectronics
STM32WB55CE - Ultra-low-power BLE SoC
STM32WB55CE
Ultra-low-power dual core Arm Cortex-M4 MCU 64 MHz, Cortex-M0+ 32 MHz with 512 Kbytes of Flash memory, Bluetooth LE 5.2, 802.15.4, USB, LCD, AES-256
Description
The STM32WB55xx and STM32WB35xx multiprotocol wireless and ultra-low-power devices embed a powerful and ultra-low-power radio compliant with the Bluetooth® Low Energy SIG specification 5.2 and with IEEE 802.15.4-2011. They contain a dedicated Arm® Cortex®-M0+ for performing all the real-time low layer operation.
The devices are designed to be extremely low-power and are based on the high-performance Arm® Cortex®-M4 32-bit RISC core operating at a frequency of up to 64 MHz. This core features a Floating point unit (FPU) single precision that supports all Arm®single-precision data-processing instructions and data types. It also implements a full set of DSP instructions and a memory protection unit (MPU) that enhances application security.
Features
Radio
- 2.4 GHz
- RF transceiver supporting Bluetooth® 5.2 specification, IEEE 802.15.4-2011 PHY and MAC, supporting Thread and Zigbee® 3.0
- RX sensitivity: -96 dBm (Bluetooth® Low Energy at 1 Mbps), -100 dBm (802.15.4)
- Programmable output power up to +6 dBm with 1 dB steps
- Integrated balun to reduce BOM
- Support for 2 Mbps
- Support advertising extension
- Dedicated Arm® 32-bit Cortex® M0+ CPU for real-time Radio layer
- Accurate RSSI to enable power control
- Suitable for systems requiring compliance with radio frequency regulations ETSI EN 300 328, EN 300 440, FCC CFR47 Part 15 and ARIB STD-T66
- Support for external PA
- Available integrated passive device (IPD) companion chip for optimized matching solution (MLPF-WB-01E3 or MLPF-WB-02E3)
Ultra-low-power platform
- 1.71 to 3.6 V power supply
- – 40 °C to 85 / 105 °C temperature ranges
- 13 nA shutdown mode
- 600 nA Standby mode + RTC + 32 KB RAM
- 2.1 µA Stop mode + RTC + 256 KB RAM
- Active-mode MCU: < 53 µA / MHz when RF and SMPS on
- Radio: Rx 4.5 mA / Tx at 0 dBm 5.2 mA
Core
- Arm® 32-bit Cortex®-M4 CPU with FPU, adaptive real-time accelerator (ART Accelerator) allowing 0-wait-state execution from Flash memory, frequency up to 64 MHz, MPU, 80 DMIPS and DSP instructions
Performance benchmark
- 1.25 DMIPS/MHz (Drystone 2.1)
- 219.48 CoreMark® (3.43 CoreMark/MHz at 64 MHz)
Energy benckmark
- 303 ULPMark™ CP score
Supply and reset management
- High efficiency embedded SMPS step-down converter with intelligent bypass mode
- Ultra-safe, low-power BOR (brownout reset) with five selectable thresholds
- Ultra-low-power POR/PDR
- Programmable voltage detector (PVD)
- VBAT mode with RTC and backup registers
Clock sources
- 32 MHz crystal oscillator with integrated trimming capacitors (Radio and CPU clock)
- 32 kHz crystal oscillator for RTC (LSE)
- Internal low-power 32 kHz (±5%) RC (LSI1)
- Internal low-power 32 kHz (stability ±500 ppm) RC (LSI2)
- Internal multispeed 100 kHz to 48 MHz oscillator, auto-trimmed by LSE (better than ±0.25% accuracy)
- High speed internal 16 MHz factory trimmed RC (±1%)
- 2x PLL for system clock, USB, SAI and ADC
Memories
- Up to 1 MB Flash memory with sector protection (PCROP) against R/W operations, enabling radio stack and application
- Up to 256 KB SRAM, including 64 KB with hardware parity check
- 20x32-bit backup register
- Boot loader supporting USART, SPI, I2C and USB interfaces
- OTA (over the air) Bluetooth® Low Energy and 802.15.4 update
- Quad SPI memory interface with XIP
- 1 Kbyte (128 double words) OTP
Rich analog peripherals (down to 1.62 V)
- 12-bit ADC 4.26 Msps, up to 16-bit with hardware oversampling, 200 µA/Msps
- 2x ultra-low-power comparator
- Accurate 2.5 V or 2.048 V reference voltage buffered output
System peripherals
- Inter processor communication controller (IPCC) for communication with Bluetooth® Low Energy and 802.15.4
- HW semaphores for resources sharing between CPUs
- 2x DMA controllers (7x channels each) supporting ADC, SPI, I2C, USART, QSPI, SAI, AES, timers
- 1x USART (ISO 7816, IrDA, SPI Master, Modbus and Smartcard mode)
- 1x LPUART (low power)
- 2x SPI 32 Mbit/s
- 2x I2C (SMBus/PMBus®)
- 1x SAI (dual channel high quality audio)
- 1x USB 2.0 FS device, crystal-less, BCD and LPM
- Touch sensing controller, up to 18 sensors
- LCD 8x40 with step-up converter
- 1x 16-bit, four channels advanced timer
- 2x 16-bit, two channels timer
- 1x 32-bit, four channels timer
- 2x 16-bit ultra-low-power timer
- 1x independent Systick
- 1x independent watchdog
- 1x window watchdog
Security and ID
- Secure firmware installation (SFI) for Bluetooth® Low Energy and 802.15.4 SW stack
- 3x hardware encryption AES maximum 256-bit for the application, the Bluetooth® Low Energy and IEEE802.15.4
- Customer key storage / key manager services
- HW public key authority (PKA)
- Cryptographic algorithms: RSA, Diffie-Helman, ECC over GF(p)
- True random number generator (RNG)
- Sector protection against R/W operation (PCROP)
- CRC calculation unit
- Die information: 96-bit unique ID
- IEEE 64-bit unique ID. Possibility to derive 802.15.4 64-bit and Bluetooth® Low Energy 48-bit EUI
Up to 72 fast I/Os, 70 of them 5 V-tolerant
Development support
- Serial wire debug (SWD), JTAG for the application processor
- Application cross trigger with input / output
- Embedded Trace Macrocell™ for application
All packages are ECOPACK2 compliant
*STMicroelectronics Authorized Distributor
